Auto-generated GraphQL docs indent sections beyond h6

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When GraphQL reference is generated (script | template), some sections are nested too deep, beyond six levels - there's no heading 7.

For example:

Raw Markdown	In GitLab Markdown preview	In rendered documentation
####### Arguments	####### Arguments	# Arguments (as heading 6)

• Generated docs page: https://docs.gitlab.com/api/graphql/reference/
• Source: https://gitlab.com/gitlab-org/gitlab/-/blob/master/doc/api/graphql/reference/_index.md?plain=1

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The following discussion from !79327 (merged) should be addressed:

• @msedlakjakubowski started a discussion: (+1 comment)

  Hmmm, I need to check how this renders on the doc 🤔 There's no heading 7:

  # h1
  
  ## h2
  
  ### h3
  
  #### h4
  
  ##### h5
  
  ###### h6
  
  ####### h7?